Fluid-pump.



R. H. SLEICHER.

FLUID PUMP.

APPLICATION FILED AUG. 9. 1916-.

1,227,845. Patented May 29,1917.

' w Q s RALPH H. SLEICHER, 0F TROY, NEW YORK FLUID-PUMP.

Specification of Letters Patent.

Patented May 29, 1917.

Application filed August 9, 1916. Serial No. 113,913.

To all whom it may concern:

Be it known that I, RALPH H. SLEIOHER, a citizen of the United States of America, residing at Troy, in the county of Renselaer and State of New'York, have invented new and useful Improvements in Fluid- Pumps, of which the following is a specification.

The present invention relates to improvements in fluid pumps under the broad class of air and gas pumps, and is designed to improve certain features of this class of pumps in order to provide a compactly ar ranged and eiiiciently operated air pump for use as an accessory on automobiles, as well as for use in other places or under other conditions, which is economically, and at the same time efficiently lubricated by the action of the piston in the cylinder. To this end the invention consists in certain novel combinations and arrangements of parts as will be hereinafter set forth and claimed.

In the accompanying drawings I have illustrated one complete example of the physical embodiment of my invention constructed according to the best mode I have so far devised for the practical application of the principles of my invention, and a modification thereof is also illustrated.

Figure 1 is a vertical sectional view of a fluid pump built according to my invention, and showing my improvements.

Fig. 2 is a similar view of the same pump taken at right angles to Fig. 1. v

Fig. 3 is an enlarged detailed view of a portion. of the piston, and Fig. 4: is a similar view of a modification.

In the preferred embodiment of my in vention as illustrated in the drawings I have utilized for purposes of exemplification a standard form or type of fluid or air pump which comprises the usual. base 1 in which the oil for lubrication is contained as indicated by the horizontal dotted line in Figs. 1 and 2. provided in the base for the driving shaft 3, and the usual cylinder 41 is attached to the base in any suitable and approved manner. In the top of the cylinder the outlet valve 5 and inlet valve 6 perform their functions, providing passage for fluid through the head which is perforated for the purpose and formed with valve seats in customary manner.

A pair of bearings 2 2 is The piston 7 which reciprocates in the cylinder is of the hollow type and is equipped with the packing ring 8 in the groove 9, and the wrist pin '10, it will be observed is carried in a pair of perforated ears or lugs 11 11 located diametrically of the piston and projecting therebelow. The eccentric 12 on the driving shaft is con nected with the wrist pin through the medium of the eccentric strap 13, and it will be evident that the piston is made to reciprocate through the eccentric connection with the driving shaft 3. In its reciprocatory movement the piston is guided by means of two rods 14, which are fixed in bosses 15 disposed circumferentially in diametrically arranged pairs about the center of the hollow piston, and integral therewith.- These posts or rods are positioned at the sides of the eccentric and they straddle the driving shaft 3. and pass through perforated guide blocks 16 16 arranged one at each side of the eccentric. By this means the stability of the piston is greatly enhanced. for the reason that the length of the guide posts or rods is sufficient to maintain a portion thereof at all times in the guide blocks. and even when the iston is at the end of its, upstroke it will be evident that the long bearing rovided for the piston will prevent wabbling or irregularities therein.

For the .purpose of providing perfect lubrication for the piston in the cylinder I attach at the lower end of the piston, a felt ring 17 of proper thickness. which is secured to the piston by means of a steel plate or washer 18. Screws or other devices as 18 maybe utilized to hold the felt washer in place, and it will be understood that under normal conditions the washer 17 is not under compression, the steel plate 18 being used only for the purpose of retaining the felt washer in place. The felt of course is an absorbent material and will absorb oil or lubricating liquid that. is splashed up by the action of the eccentric in the oil chamber in the base 1. As an abutment against which the steel plate 18 may contact, I fashion the upper portion of the base with a pair of circumferential flanges or ledges 19 extending around the upper inner walls of the base, except at the diametrically opposite points Where they would obstruct the movement of the eccentric. The flanges however provide a broad and sufficient bearing for contact by the steel plate of the piston. Thus the steel plate 18, on the downward stroke of the piston 7 presses againstthe ledges or flanges 19 compressing the felt washer and forcing it to protrude at its edges and allowing it as it travels back over the cylinder walls and in close frictional contact therewith, to take off any excess oil from the cylinder wa1ls,,and also, if the cylinder walls should get dry, to lubricate the cylinder from the small amount of oil which is always retained in the felt washer.

A modification of this lubricating feature is illustrated in Fig. 4 where the piston 7 is illustrated with an exterior circumferential groove 9 in which the felt washer 17 is seated. This washer lubricates and cleans the walls of the cylinder as it reciprocates with the piston 7.

lVhat I claim is 1. The combination in a fluid pump with an oil chamber, of a cylinder above the chamber, a piston. rcciprocable in the cylinder, a crank, a connecting rod and an abutment located below the lower end of the cylinder, and an absorbent compression member carried at the lower end forming an extension of the piston adapted to contact with said abutment, for the purpose de scribed.

2. The combination in a fluid pump with a base forming an oil chamber, of a cylinder on the base and a crank shaft and connecting rod and a piston reciprocable in the cylinder, an abutment located below the lower end of the cylinder, a compressible absorbent member on the lower end of the piston, and a retaining plate for the member carried bythe piston adapted to contact with said abutment.

3. The combination in a fluid pump with a base forming an oil chamber, of a cylinder on the base and a piston reciprocable therein, and a crank shaft and a connecting rod, a flanged portion in the upper part of the base, a felt washer and a retaining plate therefor on the lower end of the piston, and said plate adapted to contact with said flanged portion to compress the washer.

In testimony whereof I aflix my signature.

RALPH H. SLEIOHER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

